Page:
Home > General Chat > Bike Engined Minis

Rob H

4314 Posts
Member #: 700
Formerly British Open Classic

The West Country

On 14th of Dec, 2006 at 07:57am johnK said:
The theory should work - in reality the rear suspension design is not correct for the application - this goes for all rear engined versions not just bikes. Utilising trailing arm suspension as a suspension set up to transfer power to driven wheels is the problem.


The only cars I can think of that are rear wheel drive with trailing arms are the US NASCARs which only go round banked ovals and Ford Sierras (not strictly trailing arms but close) and there reputation for corners is legendary* especially the sapphire cosworths.

Edit:

* = Legendary does not mean the same thing as good!

Edited by Rob H on 17th Dec, 2006.

Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer


johnK

1425 Posts
Member #: 690
Post Whore

Norfolk

You'll find the sierra has more links in the rear suspension than just a simple trailing arm - hence when you slam then the neggy camber is impressive! With a a conventional ride height in cornering you'll have the desired effects - ie camber gain and more than likely a little toe correction as well. Manufacturers spend massive amounts of money in developing suspension systems and bushes which can make "simple" suspension systems articulate to give some degree of camber gain. You'll see none of these with two bits of tube and rose joints at the end of them. A multi link rear set up is the only way to make a rear driven mini work for ride and handling.

If Carling made Mini engines
it would probably be like this one!


RogerM

User Avatar

2514 Posts
Member #: 1217
I like nice quiet girly Minis

Cheltenham, Gloucestershire

The Sierra is technically a semi- trailing arm with the arm neither perpendicular to the road or the centre line of the chassis.

I wouldn't say the Cossie had a great reputaion for corners ..... When I had my Scooby a guy who though he was the gods gift to driving managed to junk his escy cos into the same tree 3 times in as many months trying to prove it out handled a scooby .... prat .. scob wasn't even trying!!!

In theory semi-trailing arms can be made to work well, but only over a limited travel range.

The other thing to consider is the torque reactions from drive and braking which can have considerable effects on a semi trailing arm.

There is no real substitue for a unequal double wishbone suspension. The only reason we don't see it on everying is the space it takes up .... most manufactures will choose to go for a single lower link, a pair of trailing or leading links and a camber control link in preference to double wishbone as it gives a very similar level as convensional double wishbones but without intruding into the rear passenger space or boot areas much.

Suspension design is one of the many things that always will be a compromise but you have to get close or else you'll spend lots of time visiting the hedge.


What I don't understand is why most of the rear engine conversions don't use double wishbones ..... it's not like you can carry the shopping home in the back or take your mates to the pub ......

Edited by RogerM on 17th Dec, 2006.

Every day is a school day ...........

How fast and how expensive ...... the same question...

On 27th of Sep, 2007 at 12:45pm Jimster said:

why do you you think I got a girlfriend with small hands?


MadMatt

User Avatar

703 Posts
Member #: 105
1st to provide proof of a running Bimmy Conversion!

Brisbane ,Australia

http://madmatt.bigblog.com.au/data/1/8412/...61219010234.jpg

one from a few months ago,,, it`s almost a complete car now tho,,, i`ll steal the digi cam from my girlfriend this weekend & get some more current pics. *smiley*

http://madmatt.bigblog.com.au/data/1/8412/...61219010234.jpg

the steering rack, pedals & brakes are all on now , as is quite a bit more triangular bar work. still have to strip it all down, sandblast & paint it all yet, then stick all that alloy sheet cladding & stuff on to make it look a bit more proffesional (amazing how well dodgy back yard specials come up with a lick of paint & some shiny alloy panels hey??? *smiley* )& then just have to whack it all back together agin. then the real fun begins, like adding the turbo etc *smiley*

Edited by MadMatt on 18th Dec, 2006.

www.miniman.com.au

"""LazyGoodForNothingSmartArseKnowItAllBackYardMiniMechanic"""

Home > General Chat > Bike Engined Minis
Users viewing this thread: none. (+ 1 Guests) <- Prev  
To post messages you must be logged in!
Username: Password:
Page: